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Finding the Fourth Proportional to 28,410.90, 42,616.35 and 8,689.47

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Solution

The fourth proportional to 28,410.90, 42,616.35 and 8,689.47 is: 13,034.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,410.90 : 42,616.35 = 8,689.47 : x
  2. Step 2: Convert to fraction form
    28,410.90/42,616.35 = 8,689.47/x
  3. Step 3: Cross multiply
    28,410.90x = 42,616.35 × 8,689.47
  4. Step 4: Simplify right side
    28,410.90x = 370,313,494.83
  5. Step 5: Solve for x
    x = 370,313,494.83/28,410.90
  6. Step 6: Final answer
    x = 13,034.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.